Improved structure of computer keyboard and circuit board

Claim 1

An improved computer keyboard and circuit apparatus comprising a one-piece housing panel, an array of rectangular holes having lateral edges formed in the top of said housing panel, a protrusion formed at the lateral edges of said holes, a through downwardly extending guide sleeve provided in said housing panel between each two of said rectangular holes, a rubber seal at the lower end of said guide sleeve, a plurality of keyboard push buttons, each of said buttons comprising a pair of "U"-shaped guide plates positioned one on each lateral side of said button, said protrusions and said guide plates cooperating to both hold said button on said panel and to guide the motion of said button with respect to said panel, a hollow guide pin portion extending downwardly centrally of said button and between said guide plates, a pawl like gripping seat formed at the end of said guide pin portion, a foam sensor mounted in said gripping seat, a rubber body mounted on said guide pin portion between said button and said housing panel, said rubber body having relatively thicker walls in its end regions and a relatively thinner wall in its central region, a circuit board, contact means protruding from said circuit board towards said button, and a conductive layer at the end of said foam sensor and adapted to contact said contact means when said button is operated.